I didn't mean for the imperfect example of the Danes to take it off tangent, it was only to illustrate a people I could think of for whom raiding was integral but your examples or any other is just as well. I think someone (civ) could have taken it further and been sociopathic and only relied on military force for survival. Obviously there are benefits in diversifying, but I think while not ideal, it's possible and could work, in some circumstances.